Life history traits of Notothenia rossii and N. coriiceps along the southern Scotia Arc
Notothenia coriiceps and Notothenia rossii are two widespread nototheniid fishes, that live sympatrically along the southern Scotia Arc from South Georgia to the South Shetland Islands. In this sector of the Southern Ocean, they experienced different exploitation rates in the past and exhibit differ...
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ftunibolognairis:oai:cris.unibo.it:11585/805097 2024-09-09T20:00:21+00:00 Life history traits of Notothenia rossii and N. coriiceps along the southern Scotia Arc Cali F. Riginella E. La Mesa M. Mazzoldi C. Cali F. Riginella E. La Mesa M. Mazzoldi C. 2017 ELETTRONICO http://hdl.handle.net/11585/805097 https://doi.org/10.1007/s00300-016-2066-z eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000406338800007 volume:40 issue:7 firstpage:1409 lastpage:1423 numberofpages:15 journal:POLAR BIOLOGY http://hdl.handle.net/11585/805097 doi:10.1007/s00300-016-2066-z info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85008441698 Age structure Fecundity Gonad Nototheniidae Otolith Reproduction info:eu-repo/semantics/article 2017 ftunibolognairis https://doi.org/10.1007/s00300-016-2066-z 2024-07-08T14:06:47Z Notothenia coriiceps and Notothenia rossii are two widespread nototheniid fishes, that live sympatrically along the southern Scotia Arc from South Georgia to the South Shetland Islands. In this sector of the Southern Ocean, they experienced different exploitation rates in the past and exhibit different habitat and food preferences as adult. Aiming to evaluate the influence of these factors in shaping life history traits of these species, we compare the reproductive investment and the age structure between the species and in N. rossii, between populations inhabiting different areas. Based on histological analyses, the two species share the same pattern of gamete development in both sexes. The potential fecundity was similar and was positively related to fish size in both species, being relatively high with respect to other notothenioids and in terms of egg size at deposition. Based on sagittal otolith readings, the growth rate and maximum age recorded differed significantly between the two species. Notothenia rossii exhibited a higher growth rate and a comparatively lower maximum age than N. coriiceps. Similarly, N. rossii attained sexual maturity at the same age but at a larger size than N. coriiceps. At the intraspecific level, no differences in life history traits were observed between the populations of N. rossii collected from different areas. Consistent with the different levels of fishing pressure exerted on these species and their low resilience, a recent significant decrease over time in the maximum fish size and related reproductive potential has been observed only in the overexploited populations of N. rossii. Article in Journal/Newspaper Notothenia rossii South Shetland Islands Southern Ocean IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) South Shetland Islands Southern Ocean Polar Biology 40 7 1409 1423 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
Age structure Fecundity Gonad Nototheniidae Otolith Reproduction |
spellingShingle |
Age structure Fecundity Gonad Nototheniidae Otolith Reproduction Cali F. Riginella E. La Mesa M. Mazzoldi C. Life history traits of Notothenia rossii and N. coriiceps along the southern Scotia Arc |
topic_facet |
Age structure Fecundity Gonad Nototheniidae Otolith Reproduction |
description |
Notothenia coriiceps and Notothenia rossii are two widespread nototheniid fishes, that live sympatrically along the southern Scotia Arc from South Georgia to the South Shetland Islands. In this sector of the Southern Ocean, they experienced different exploitation rates in the past and exhibit different habitat and food preferences as adult. Aiming to evaluate the influence of these factors in shaping life history traits of these species, we compare the reproductive investment and the age structure between the species and in N. rossii, between populations inhabiting different areas. Based on histological analyses, the two species share the same pattern of gamete development in both sexes. The potential fecundity was similar and was positively related to fish size in both species, being relatively high with respect to other notothenioids and in terms of egg size at deposition. Based on sagittal otolith readings, the growth rate and maximum age recorded differed significantly between the two species. Notothenia rossii exhibited a higher growth rate and a comparatively lower maximum age than N. coriiceps. Similarly, N. rossii attained sexual maturity at the same age but at a larger size than N. coriiceps. At the intraspecific level, no differences in life history traits were observed between the populations of N. rossii collected from different areas. Consistent with the different levels of fishing pressure exerted on these species and their low resilience, a recent significant decrease over time in the maximum fish size and related reproductive potential has been observed only in the overexploited populations of N. rossii. |
author2 |
Cali F. Riginella E. La Mesa M. Mazzoldi C. |
format |
Article in Journal/Newspaper |
author |
Cali F. Riginella E. La Mesa M. Mazzoldi C. |
author_facet |
Cali F. Riginella E. La Mesa M. Mazzoldi C. |
author_sort |
Cali F. |
title |
Life history traits of Notothenia rossii and N. coriiceps along the southern Scotia Arc |
title_short |
Life history traits of Notothenia rossii and N. coriiceps along the southern Scotia Arc |
title_full |
Life history traits of Notothenia rossii and N. coriiceps along the southern Scotia Arc |
title_fullStr |
Life history traits of Notothenia rossii and N. coriiceps along the southern Scotia Arc |
title_full_unstemmed |
Life history traits of Notothenia rossii and N. coriiceps along the southern Scotia Arc |
title_sort |
life history traits of notothenia rossii and n. coriiceps along the southern scotia arc |
publishDate |
2017 |
url |
http://hdl.handle.net/11585/805097 https://doi.org/10.1007/s00300-016-2066-z |
geographic |
South Shetland Islands Southern Ocean |
geographic_facet |
South Shetland Islands Southern Ocean |
genre |
Notothenia rossii South Shetland Islands Southern Ocean |
genre_facet |
Notothenia rossii South Shetland Islands Southern Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000406338800007 volume:40 issue:7 firstpage:1409 lastpage:1423 numberofpages:15 journal:POLAR BIOLOGY http://hdl.handle.net/11585/805097 doi:10.1007/s00300-016-2066-z info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85008441698 |
op_doi |
https://doi.org/10.1007/s00300-016-2066-z |
container_title |
Polar Biology |
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40 |
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7 |
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1409 |
op_container_end_page |
1423 |
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1809931575283941376 |